added objectstore.refresh(), including supporting changes in mapper, attributes, util

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/sqlalchemy/util.py b/lib/sqlalchemy/util.py
index a0e0e244c..618900fcf 100644
--- a/lib/sqlalchemy/util.py
+++ b/lib/sqlalchemy/util.py
@@ -327,6 +327,10 @@ class HistoryArraySet(UserList.UserList):
         self.records = {}
         for l in list:
             self.append_nohistory(l)
+    def clear(self):
+        """clears the list and removes all history."""
+        self.data[:] = []
+        self.records = {}
     def added_items(self):
         """returns a list of items that have been added since the last "committed" state."""
         return [key for key in self.data if self.records[key] is True]